Change TTS Source button
To let your users change sources at runtime (to change languages, for example), copy a Change TTS Source button from the ToolBook Translation System catalog into your book.
This button will display the Select TTS Source window:
Optional: Instructor users can modify the caption of this viewer by specifying a caption in the second parameter of the handler call. For example, you could change the caption from "Select TTS Source" to "Select a Language" with the following call:
send TTS_selectCurrentSource null, "Select a Language"